Given f(x) = 2x2 -1 find f(2+h)- f(2) over h

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f (x+h)= 2 times 2 - 1

x+h=4

h=4-x

replace every "h"

f(2+(4-x)-f(2) over 4-x

The answer is

f(6-x) - f(2) over 4-x

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